How to Create an Estimate for an Electrical Rewiring Job (Step by Step)

Why Electrical Rewiring Estimates Are Different

Most electrical jobs have a predictable scope: swap a panel, add outlets, install a fan. Whole-home rewiring is different. The scope can expand dramatically once walls are opened, the scope of existing damage is unknown, and the permits required add both time and cost. A bad rewiring estimate doesn't just hurt your margin — it can lock you into a job that costs you money for months.

This guide walks through every step of building a rewiring estimate that protects you and wins customer trust — from the site assessment through the final proposal document.

Step 1: Conduct a Thorough Site Assessment

Never estimate a rewiring job from a phone call. You need eyes on the property. A site visit accomplishes three things: it lets you understand the actual scope, it demonstrates professionalism to the homeowner, and it uncovers surprises before they become your problem.

What to Look For During the Walk-Through

• Panel age and condition: Knob-and-tube or aluminum wiring dramatically changes the scope. Federal Pacific or Zinsco panels typically need replacement alongside rewiring.
• Square footage and number of circuits: Count bedrooms, bathrooms, kitchen circuits, dedicated appliance circuits (HVAC, range, dryer, EV).
• Access points: Finished vs. unfinished basement, attic access, whether drywall will need to be cut and patched.
• Asbestos or knob-and-tube in insulated walls: This triggers hazmat remediation requirements and should be called out clearly in your estimate.
• Number and location of junction boxes: Older homes often have hidden junction boxes that need to be brought into compliance.
• Permit requirements: Call your local AHJ before estimating. Permit fees, inspection schedules, and load calculation requirements vary significantly by jurisdiction.

Step 2: Calculate Your Material Costs

Material costs for a full rewire are substantial and variable. Build your material list from your circuit count, then add a 10–15% waste/overage buffer. Never use round numbers from memory — supplier prices change, and even small errors compound across a large job.

Key Material Categories

• Wire: Price per foot varies by gauge (14/2, 12/2, 10/2, 8/3). Calculate run lengths per circuit, add 20% for routing. A 2,000 sq ft home typically uses 2,000–3,500 feet of wire total.
• Devices: Outlets, switches, GFCI/AFCI breakers. Count every location on your walk-through. AFCI breakers alone run $25–$50 each and are required in most jurisdictions for bedroom circuits.
• Panel: If upgrading to 200A, budget $150–$400 for the panel box alone, plus breakers.
• Conduit and fittings: Required in garages, unfinished basements, and exposed exterior runs.
• Staples, wire nuts, boxes, covers: These add up. Budget $200–$400 in miscellaneous hardware for a typical home.

Note: These are rough planning figures. Always build a line-item material list from your actual walk-through. Homes with finished basements or difficult attic access will run toward the high end of labor estimates.

Step 3: Estimate Labor Hours Accurately

Labor is where most rewiring estimates go wrong. The tendency is to estimate based on best-case scenarios — good attic access, cooperative walls, no surprises. Build your estimate on average-case assumptions and add a contingency buffer.

Labor Time Rules of Thumb

• Per circuit (rough-in): 1.5–3 hours per circuit for a 2-person crew depending on run length and access
• Panel replacement: 4–8 hours including new panel, breakers, and labeling
• Device trim-out: 30–45 minutes per device location (outlets, switches, fixtures)
• Drywall support: If you're responsible for patch and paint, add 15–25% to total labor
• Inspections: Budget 2–4 hours total for rough-in and final inspection coordination

For a 2,000 sq ft home with 40 circuits, you're typically looking at 140–200 total labor hours for a 2-person crew. At $85–$120/hr per person, labor alone runs $12,000–$24,000 before materials. That's why rewiring estimates need to be precise.

Step 4: Add Overhead, Permits, and Profit

Once you have materials and labor, you're not done. There are several cost categories that contractors regularly forget, turning a profitable job into a break-even one.

Don't Forget These Line Items

• Permit fees: Typically $500–$2,000 depending on jurisdiction and home size. Always get the exact permit fee before finalizing the estimate.
• Subcontractor costs: If you're hiring a drywall crew for repairs, quote their work separately and mark it up 10–15%.
• Temporary power: If the home will be occupied during the rewire, you may need a temporary meter or panel disconnect arrangement.
• Overhead allocation: Include a percentage of your business overhead (insurance, vehicle, tools) in every estimate. A 15–20% overhead load on labor is standard.
• Profit margin: Add 15–25% net profit on top of fully loaded costs. On a $20,000 job, that's $3,000–$5,000 that stays in your business — not your take-home.

Step 5: Structure the Estimate Document

A professional rewiring estimate isn't just a number — it's a document that protects you legally, sets clear expectations, and makes it easy for the homeowner to say yes. Vague estimates invite disputes. Detailed estimates build trust.

What Your Estimate Should Include

• Scope of work: List every circuit, every panel component, every service included. Be explicit about what is AND is not included (e.g., "drywall repair not included").
• Materials section: Itemize wire, devices, panel components. Customers don't need to see your costs, but showing categories builds confidence.
• Timeline: Estimated start date, duration, and major milestones (rough-in complete, inspection day, trim-out complete).
• Permit language: State that permits are included or excluded and who is responsible for pulling them.
• Payment terms: Specify deposit (typically 30–40%), progress payment at rough-in complete, and final payment at trim-out/inspection pass.
• Change order policy: Include a line stating that any work outside the written scope requires a signed change order before proceeding.
• Validity period: State that the estimate is valid for 30 days due to material pricing fluctuations.

How to Present the Estimate to the Homeowner

For a $15,000–$40,000 job, the homeowner deserves a conversation — not just an email. Schedule a 30-minute review call or in-person presentation where you walk through the estimate section by section.

• Start with what you found during the walk-through — this demonstrates your thoroughness and justifies the price
• Explain the code requirements driving certain line items (AFCI breakers, GFCI placement) — these aren't optional
• Show the timeline visually if possible — homeowners want to know how long their home will be disrupted
• Address price objections by explaining what's included, not by lowering your number
• Offer a tiered option if appropriate (e.g., Option A includes drywall repair; Option B is wiring only, homeowner handles drywall)

Common Rewiring Estimate Mistakes

1. Not accounting for knob-and-tube removal

Removing old wiring takes time and generates debris that needs to be disposed of. Budget separately for K&T removal — it's not included in circuit-by-circuit estimates.

2. Forgetting the scope of drywall work

Fishing wire through finished walls inevitably means drywall cuts. Either include repair in your scope (and add it to the price) or explicitly exclude it in writing. Never leave it ambiguous.

3. Underestimating inspection coordination time

Some jurisdictions require 24–48 hours notice for inspections and may fail on minor technicalities that require a re-inspection. Budget this into your schedule and communicate it to the homeowner upfront.

4. Using a single lump-sum price

Homeowners who see a $28,000 number with no breakdown immediately start negotiating. An itemized estimate shifts the conversation from "is this too expensive?" to "are these the right items?"

Using Software to Speed Up Your Estimates

The electricians who win the most rewiring jobs aren't the cheapest — they're the fastest and most professional to respond. When a homeowner is comparing 3 quotes, the one that arrives first with a clean, detailed document has a significant advantage.

Fieldbase lets you build a rewiring estimate template with your standard circuit pricing, overhead percentages, and payment terms already built in. When you do a site assessment, you fill in the specifics — square footage, circuit count, panel type — and the estimate calculates automatically. You can send it from the job site before you leave the driveway. Customers can approve it with a single click from their phone.